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arnoldc wrote:No, I don't think so.
arnoldc wrote:4 is to 1. that's fine. in fact, all of you thought that all stylus are perpendicular to the record.
arnoldc wrote:
4 is to 1. that's fine. in fact, all of you thought that all stylus are perpendicular to the record.
fair enough?
zetroce wrote:I agree with Arnold, there's no reason for us to lock the thread. In fact, audiophileman has posted alot of information which i find interesting. Sayang naman kung titigil.arnoldc wrote:4 is to 1. that's fine. in fact, all of you thought that all stylus are perpendicular to the record.
On this note, i disagree. It never occured to me that the stylus is always perpendicular to the record. I'm just not convinced with your opinion that the change in VTA angle not the same as the change in SRA angle.
We're all learning here. We just have to accept that we have differences in opinion.
Kaya, para sa akin, tuloy lang ang post....
mandym wrote:Sure thing Arnold, just please don't make it a fact that I think all stylus are perpendicular to the record. Never said so, never believed so!
mandym wrote:Please lock this thread.
audiophileman2002 wrote:conspicuous wrote:arnoldc wrote:conspicuous, the lateral frequency is the point where your cartridge get excited and vibrates from left to right. The vertical frequency is the point where you cartridge gets excited (literally) and it jumps up and down frantic fashion.
arnold, rod (audiophileman2002) - thank you for explaining this. thanks too for this discussion as i, and others i'm sure, am learning more about analog. so far it looks like trigonometry will suffice without having to go into differential equations yet
from the equations for lateral freq i can then deduce that the infamous "grado dance" is due to the relatively high compliance of the cantilever. or is it the other way around? if the cantilever is too stiff (low compliance) then it has a tendency to be excited to do the dance? (the grado dance describes the cartridge vibrating unwantedly from side to side at certain times)
I've done the resonance frequency calculation (tonearm/cartridge) for a good friend of mine for a Scoutmaster / JMW 9 / 501 II. Compliance of the 501 II is 9, weight of the cartridge is 8 g, the tonearm mass is 7.7 g. Theoretically, the resonance frequency is 13.19 Hz. I then phoned and spoke with HW and discussed this issue and he suggested for my friend to buy his 3 g headshell weight to lower the resonance. This weight costs $15 retail. I recalculated the resulting frequency is 12.1 Hz. This should be good enough.
It's you call if you want to purchase the VPI headshell weight of 3 g. Furthermore, it is also your call if you want to find out your actual resonance frequency. You have to purchase the HFNRR test record, $50 retail.
conspicuous wrote: what happens if my resonance frequency is above the recommended 8 to 12 Hz? i have a similar system to your friend's (scout/jmw 9/shelter 501 II).
btw, the grado dance i observe is with my grado gold cart on a tp21 arm on my thorens td166II when i encounter a dirty record. cleaning the record helps reduce this phenomenon.
audiophileman2002 wrote:conspicuous wrote: what happens if my resonance frequency is above the recommended 8 to 12 Hz? i have a similar system to your friend's (scout/jmw 9/shelter 501 II).
btw, the grado dance i observe is with my grado gold cart on a tp21 arm on my thorens td166II when i encounter a dirty record. cleaning the record helps reduce this phenomenon.
I have not heard his current set up as he lives in IN and haven't been there in a while. Initially, he was complaining about his bass being not very well defined. Here is what he said after he installed the headshell weight:
Quote
What a difference. The air and spacing were incredible. The bass
was really tightened up.
Unquote
audiophileman2002 wrote:That looks super! What headshell weight did you use? How many grams? The reason for the slight positive SRA is because of the angle of the stylus cutter. It is that way, as they want the debris from the cuttings out of the way and for the cutter not to run over them. Some people want to try to follow the way the master was cut, hence slightly positive and likewise not to run over the dirt in the LP. Perpendicular is fine, just not negative. From headshell level position, if you increase your pivot by 4 mm this will give you about an additional 1 degree of VTA / SRA in a 9" arm.
Again, this is one of those "different folks, different strokes".
arnoldc wrote:very nice cartridge pornography!
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